For some special effects (i.e. using more than one line style for the same object) require you to create two objects in the exact same location. Choose Transform | Create Array from the menu. Type 2 for the Horizontal Count, 0 for the Horizontal spacing, and select Every. Click OK. To alternate the selection between the two objects, use Alt and the select tool , and drag a selection rectangle over the area. The objects will alternatively be selected each time you use Alt with a selection rectangle.